In one of those videos of a higher end product, I noticed when the clcik and rotate drag started, that all of the edges automatically hid....

In the 3d pdf version, I have seen in the 3d hoops development site, that their feature is to allow to set that "Turn into wireframes when rotating" that you see in the video. The demo of it was impressive and allowed them to load and work on massive models, with the use of "adaptive degeneration". Same as MoI would do by turning everything off and setting a coarse angle, on the fly.

So, somehow it takes a "This is the point of focus" area, and keeps that at high quality, then degenerates everything outside of this value. The value is adjustable, as well as the types of degeneration.